I know is my circumtance, my husband and I have both said that. Just last night I was wondering why the hell I married a guy like him. He said the same thing to me.
I think during fights, its not mature, but quite normal to think and say irrational things that you may mean while you're mad. The question is once the fight is said and done, do you still think you dont love him.
My husband and I have been fighting like crazy the past couple months, and tomorrow we are going to see a marriage counsiler. Its alot easier just to give up and think its over. If you do want a relationship to work, you need to work it.